作者介绍了一种适用于游离缺失式义齿的卡环设计。这种卡环与基牙接触面积较少,在发挥功能时,基本上不扭动基牙。作者谈及好的卡环应具备以下条件:在承受咀嚼力时能支持义齿,防止义齿压向软组织;有对抗水平向(牙合)力的性能,固位,能制止义齿(牙合)向脱位,应有足够的长度以防卡环由基牙脱出,卡臂应有相互的抗衡作用, The author introduces a snap ring design for a free missing denture. This snap ring and abutment contact area less, in function, basically does not twist the abutment. The author noted that a good snap ring should have the following conditions: to support the denture to withstand the chewing force, to prevent the denture against the soft tissue; to resist the horizontal occlusal force performance, retention, to stop the denture (occlusion) to Dislocation, should be long enough to prevent the ring from the abutment prolapse, arm arm should have mutual antagonism,